L-2011-410, Environmental Protection Plan Report 316(b) Related Documentation

Environmental Protection Plan Report 316(b) Related Documentation

ML11306A010
Person / Time
Site:	Saint Lucie
Issue date:	09/30/2011
From:	Katzman E Florida Power & Light Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
L-2011-410
Download: ML11306A010 (32)

Text

0 Florida Power & Light Company, 6501 S. Ocean Drive, Jensen Beach, FL 34957 FPL September 30, 2011 L-2011-410 10 CFR 50.4 EPP 3.2.2 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 Re: St. Lucie Units I and 2 Docket Nos. 50-335 and 50-389 Environmental Protection Plan Report 316(b) Related Documentation Pursuant to section 3.2.2 of the St. Lucie Environmental Protection Plan, Florida Power &

Light Company (FPL) is forwarding the enclosed copy of 316(b) related documentation. The Florida Power & Light Company (FPL) - St. Lucie Nuclear Power Plant - Heated Water Plan of Study (HWPOS) is required by the amended St. Lucie Plant Industrial Wastewater Facility (IWWF) Permit No. FL0002208 - Revision, December 23, 2010, and Condition 17 of Administrative Order (AO) 022TL.

Please contact Ron Hix at (561) 691-7641 if there are any questions on this matter.

Sincerely, Eric S. Katzman Licensing Manager St. Lucie Plant ESK/kdr Enclosure an FPL Group company

St. Lucie Units I and 2 L-2011-410 Enclosure Florida Power & Light Company (FPL)

St. Lucie Nuclear Power Plant Heated Water Plan of Study (HWPOS)

(VPPSL036)

Cover Letter, Bound Report &

Back Matter from BPOS (33 Pages)

0 Florida Power & Light Company, 6501 S. Ocean Drive, Jensen Beach, FL 34957 FPL September 30, 2011 Marc Harris, P.E. CERTIFIED MAIL Supervisor, Power Plant NPDES Permitting RETURN RECIEPT REQUESTED Industrial Wastewater Section 7006 3450 0003 0174 448 Florida Department of Environmental Protection 2600 Blair Stone Road, MS 3545 Tallahassee, Florida 32399-2400 RE: FPL - St. Lucie Plant State IWW Permit No. FL0002208 (Rev. F)

Administrative Order AO022TL Revision 1 to FPL's Heated Water Plan of Study

Dear Mr. Harris:

Enclosed please find four (4) copies of Revision 1 to FPL's Heated Water Plan of Study (HWPOS).

Revision I to the HWPOS contains the changes to Section 4.0 - Instrumentation, that were discussed and agreed to between FPL and the Department. The Department indicated its approval of FPL's HWPOS in an e-mail from Marc Harris (FDEP) to Ron Hix (FPL) diated August 18, 2011.

In addition FPL is enclosing four (4) copies of the back mnattez to FPL's Biolegical Plan of Study (BPOS).

Table 1, Figure 1 and Figure 2 were inadvertently omit*ed froi.. FYlL's transn.rt*al of the traditional BPOS and response to the Department's RAI, FPL Letter No. VPFSL16, dated June 9, 2011. The Department's approval of FPL's Biological Plan of Study was also indicated in the August 18, 2011 e-mail referenced above..

If you have any questions or need additional information on this matter, please contact Ron Hix at (561) 691-7641.

Sincerely, Richard L. Anderso Site Vice President St. Lucie Plant VPPSL036 Enclosures cc: FDEP - SE District - Dianne Hughes (2 copies)

FDEP - PSL Office - Terry Davis FDEP - Tallahassee - Siting Office - Cindy Mulkey an FPL Group company

HEATED WATER PLAN OF STUDY Florida Power & Light Company St. Lucie Nuclear Power Plant Submitted to: Florida Power & Light Company 700 Universe Boulevard Juno Beach, FL 33408 USA Submitted by: Golder Associates Inc.

6026 NW 1st Place Gainesville, FL 32607 USA CSA International Inc.

8502 SW Kansas Avenue Stuart, FL 34997 USA Distribution:

10 Copies Florida Power & Light Company 2 Copies CSA International Inc.

2 Copies Golder Associates Inc.

September 2011 103-87735

.:.4 world capabilities delivered locally (DIGolder Asociates Golder, Golder Associates and the GA globe design are trademarks of Golder Associates Corporation

-Assiocates

~~Golder September 8, 2011 103-87735 Mr. Alan Gould Florida Power & Light Company 700 Universe Boulevard Juno Beach, FL 33408 RE: HEATED WATER PLAN OF STUDY FLORIDA POWER & LIGHT COMPANY ST. LUCIE NUCLEAR POWER PLANT

Dear Mr. Gould:

Enclosed, please find 10 copies of the Heated Water Plan of Study - Revision 1 for the Florida Power &

Light (FPL) Nuclear Power Plant.

This document has been updated to reflect a change to Section 4.0 that was made to address a Florida Department of Environmental Protection question. The change was discussed in a June 23, 2011 email from Mr. John Jones (FPL) to Mr. Marc Harris (Florida Department of Environmental Protection.

If Golder can be of further service, please contact Gregory Powell at (904) 363-3430 or Isabel Johnson at (352) 336-5600.

Sincerely, GOLDER ASSOCIATES INC.

Gregory M. Powell, PhD, PE Senior Consultant and Principal GMP/ams FN: G:\Projects\103\103-87\103-87735\FINAL HWPOS\Cover Letter.docx Golder Associates Inc.

6026 NW 1 Place Gainesville, FL 32607 USA Tel: (352) 336-5600 Fax (352) 336-6603 wwwgol(der.comr Golder Associates: Operations in Africa, Asia. Australasia, Europe, North America and South America Golder, Golder Associates and the GA globe design are trademarks of Golder Associates Corporalion

S103-87735 September2011 iRev. 1 Table of Contents

1.0 INTRODUCTION

.............................................................................................................................. 1 2.0 PROJECT OBJECTIVES ........................................................................................................... 3 2.1 Surface W ater Temperature Near the Discharge Structures ................................................. 3 2.2 Coastal W aters ............................................................................................................................. 3 2.3 Potential for Re-entrainment of Heated W ater ........................................................................ 4 3.0 STATION LOCATION ............................................................................................................ 5 3.1 Surface Discharge Monitoring Stations .................................................................................. 5 3.2 18-ft Contour Monitoring Stations .......................................................................................... 5 3.3 Cooling W ater Intake Monitoring Station ................................................................................. 6 3.4 Am bient/Background Monitoring Station .................................................................................. 6 3.5 Intake and Discharge Canal Monitoring Stations ................................................................... 7 4.0 INSTRUMENTATION ....................................................................................................................... 8 5.0 MONITORING STATION BUOY ARRAY ................................................................................... 9 6.0 DATA COLLECTION ...................................................................................................................... 10 7.0 MAINTENANCE AND SERVICING .......................................................................................... 11 8.0 CURRENT PROFILING ........................................................................................................... 12 9.0 OTHER REQUIREMENTS ....................................................................................................... 13 9.1 Perm it Requirements ................................................................................................................. 13 9.2 Demobilization ............................................................................................................................ 13 10.0 HEATED W ATER REPORT ...................................................................................................... 14 11.0 SCHEDULE .................................................................................................................................... 15 List of Tables Table 1 Projected Implementation Schedule List of Figures Figure 1 St. Lucie Nuclear Plant and Thermal Discharge Plume Figure 2 Heated Water Sampling Monitoring Locations Figure 3 Temperature Array Consisting of a Surface Buoy, Multiple Subsurface Buoys, and an Anchor Appendices Appendix A Equipment Specifications Final Rev. l.docx & Associates F vGiolder

September 2011 1 103-87735 Rev. 1

1.0 INTRODUCTION

The St. Lucie Nuclear Power Plant (St. Lucie Plant) [Industrial Wastewater Facility (IWWF) Permit No.

FL 0002208] is located on a 1,132-acre site on Hutchinson Island in St. Lucie County, Florida. The plant consists of two nuclear-fueled electric-generating units. Unit 1 received an operating license in March 1976 and Unit 2 in April 1983. The St. Lucie Plant is located on the widest section of Hutchinson Island. The island is separated from the mainland on its western side by the Indian River Lagoon (IRL) and borders the Atlantic Ocean on the east (see Figure 1).

The source of once-through cooling water for the St. Lucie Plant is the Atlantic Ocean. At the location of the St. Lucie Plant on Hutchinson Island, the edge of the continental shelf extends approximately 21 miles offshore. Hutchinson Island is a barrier island that extends 22.5 miles between inlets (Ft. Pierce and St. Lucie Inlets) and attains a maximum width of 1.2 miles at the St. Lucie Plant site. Near shore, in the vicinity of the St. Lucie Plant, mean water depths typically range from 23 to 32 feet (ft) [National Oceanic and Atmospheric Administration (NOAA) Chart, 11472]. There is an offshore shoal, Pierce Shoal, approximately 2 to 3 miles offshore.

The St. Lucie Plant discharges its once-through cooling water back to open waters of the Atlantic Ocean via two discharge pipes. One discharge pipe is outfitted with a Y-port diffuser and the second with a multi-port diffuser.

The St. Lucie Plant is undergoing an extended power uprate (EPU) to increase its net electrical power generation by approximately 100 MW per unit. To accommodate the approximately 20 F increase in the discharge temperature that is projected to be associated with the EPU, a permit revision application was submitted by Florida Power & Light Company (FPL) to the Florida Department of Environmental Protection (FDEP) to change the St. Lucie Station's heated water discharge limitations in the IWWF permit. On December 23, 2010, this request was approved by the FDEP contingent upon the implementation of additional monitoring requirements. In conjunction with its approval of the facility's IWWF permit, the FDEP issued Administrative Order AO022TL. Condition 17 of this Administrative Order set forth field monitoring requirements to confirm the results of the heated water discharge plume modeling previously submitted by FPL.

Condition 17. No later than 180 days after the effective date of this Order, the Permittee shall prepare and submit for the Department's review and approval a plan of study (Heated Water POS) and schedule to confirm the results of the mathematical model used for simulating the near and far field extent of the Facility's heated water discharge. The Heated Water POS shall be designed and implemented to demonstrate that the heated water discharge from the Facility: 1) does not raise the surface temperature near the Facility's open ocean outfalls to more than 97 0 F; and 2) does not heat adjacent coastal waters more than the limitations specified in Rule 62-302.520(4)(b), FAC. This study also shall evaluate whether and to what extent the heated water discharge raises the temperature of the cooling water entering the Facility above ambient temperature. The Final Rev. l.docx  ! iss iates

September 2011 2 103-87735 Rev. 1 study shall commence within 90 days after completion of both uprate projects for Unit 1 and 2. The study shall last no less than 24 months from commencement. The results of the study shall be submitted in a report (Heated Water Report) to the Department for review and approval no later than 60 days after the approved Heated Water POS completion date. The schedule shall include milestones and the completion date.

Rule 62-302.520(4)(b), Florida Administrative Code (FAC) states "Heated water with a temperature at the Point of Discharge (POD) more than 20 F higher than ambient (natural) temperature of the Receiving Body of Water (RBW) shall not be discharged into coastal waters in any zone during the months of June, July, August, and September. During the remainder of the year, heated water with a temperature at the POD more than 4' F higher than ambient (natural) temperature of the RBW shall not be discharged into coastal waters in any zone. In addition, during June, July, August, and September, no heated water with a temperature above 920 F shall be discharged into coastal waters. Further no heated water with a temperature above 90° F shall be discharged into coastal waters during the period October thru May."

Coastal waters, as defined in Rule 62-302.520(3), in the Atlantic Ocean in the vicinity of the St. Lucie Plant include all waters shoreward of the 18-depth contour as shown on Coast and Geodetic Survey Charts. All waters seaward of this contour, as defined in Rule 62-302.520(3), are open waters. Rule 62-302.520(4)(c), FAC, states that for open waters "the surface temperature of the RBW shall not be raised to more than 970 F and the POD must be sufficient distance offshore to ensure that the adjacent coastal waters are not heated beyond the temperatures permitted in such waters.

In addition, Condition 14 of Administrative Order A0022TL required the completion of a feasibility study Ambient Monitoring Report (AMR) for installing permanent remote thermometers to monitor ambient temperatures. The purpose of the AMR was to determine the appropriate ambient Atlantic Ocean temperature to be used for mixing zone/thermal impact modeling. Since that time, FPL proposed that the determination of an appropriate ambient temperature could be satisfied as part of the HWPOS. The results of the HWPOS will determine whether or not a permanent remote ambient temperature monitoring station will need to be sited in the Atlantic Ocean.

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September 1 2.0 PROJECT OBJECTIVES The objective of the Heated Water Plan of Study (HWPOS) is to develop data to confirm the predictions of the mathematical thermal model for simulating the near-field and far-field extent of the St. Lucie Plant's heated water plume in the Atlantic Ocean. The HWPOS includes three components:

" demonstrate that the discharge of cooling water from the St. Lucie Plant does not raise surface water temperatures in the vicinity of the open ocean outfalls to more than 97 degrees Fahrenheit (*F);

" demonstrate that the open ocean cooling water outfalls do not heat adjacent coastal waters above the limitations specified in 62-302.520(4)(b), FAC; and

" evaluate whether, and to what extent, the St. Lucie Plant's cooling water discharge raises the temperature of the cooling water being drawn into the St. Lucie Plant above ambient temperature.

To achieve these objectives, heated water temperature monitoring stations will be established (or existing stations utilized) at several locations:

" near the St. Lucie Plant open ocean discharge outfalls,

" at the 18-ft contour,

" in the vicinity of the St. Lucie Plant intake structures as well as the intake and discharge canals, and

" an ambient (background) temperature monitoring station and two velocity profiling stations will also be included in the study.

The proposed location of these stations is shown in Figure 2. The following subsections summarize the thermal modeling output information considered in the selection of station locations.

2.1 Surface Water Temperature Near the Discharge Structures The first requirement of Condition 17 is to confirm that the surface temperature in the vicinity of the discharges is not raised above 97' F. Since "surface temperature" is not defined in 62-302.520, FAC, for the purposes of this study it is taken to be the uppermost 2 ft of the water column. Surface temperature measurements will be collected at a depth between 1 ft and 2 ft below the surface. Modeling results indicate that peak surface temperatures occur within 100 to 200 ft of the discharge from the Y-port diffuser. For the multi-port diffuser, maximum surface temperatures occur within 0 to 50 ft of the discharge pipe.

2.2 Coastal Waters The second requirement of Condition 17 is to verify that coastal waters (shoreward of the 18-ft depth contour) are not heated beyond the limitations of Rule 62-302.520(4)(b), FAC. These regulations allow for a maximum coastal temperature increase of 2 0F above ambient during summer months (June to September) and 40 F above ambient for the remainder of the year. Three monitoring stations are Final Vev. 1.docx Golder

September 2011 4 103-87735 Rev. 1 proposed to meet this requirement. The first station will be located between the discharge pipes at the 18-ft contour. This is the closest point in coastal waters to the source of heated water. Two other stations will be located between 0.5 mile and 1.0 mile north and south along the 18-ft contour, at locations where the modeling results suggest the greatest possibility of heated water incursion into coastal waters.

This study is also designed to provide a comparison to the ambient temperature of the coastal waters. To make this comparison the HWPOS proposes to take advantage of the buoyant properties of the discharge plume. Warmer water is less dense than cooler water and therefore, if present, the plume would be expected to be found at the surface. At each station, temperatures will be recorded at three depths:

surface, mid-depth, and near the bottom. If the plume crosses the 18-ft depth contour, it can be identified by the difference between the surface temperature and temperature at depth. The vertical profiling current meters will provide data to assess if conditions exist that would cause an incursion of heated water (i.e., currents with an onshore component). Also, incursion of heated water at more than one coastal station simultaneously would be highly unlikely. Therefore, the stations where incursion of heated water is unlikely can be used to determine if natural temperature stratification is present in the coastal ambient temperature profile. This information will be used to determine the temperature rise caused by the heated water incursion.

2.3 Potential for Re-entrainment of Heated Water An ambient temperature monitoring station has been incorporated into the HWPOS to ensure that all necessary data are available to make the assessments required by Condition 17. Ambient temperature data will be used as the baseline against which intake temperatures will be compared. In this manner, any detected rise in the temperature of intake water relative to the ambient temperature will be evaluated.

The coastal monitoring stations are not used for intake ambient monitoring because the velocity caps (intakes) are in deeper open waters.

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September 2011 5 103-87735 SRev. 1 3.0 STATION LOCATION There are five types of monitoring stations included in the HWPOS:

" Surface Discharge Monitoring Stations;

" 18-ft Contour Monitoring Stations;

" Cooling Water Intake Monitoring Station;

" Ambient/Background Monitoring Station; and

" Intake and Discharge Canal Monitoring Stations.

The offshore monitoring stations will consist of single and multiple-temperature logger arrays located in water depths from 18 ft to approximately 30 ft (see Figure 2). The criteria used to select the station locations are discussed below.

3.1 Surface Discharge Monitoring Stations Surface discharge monitoring stations will be located where the thermal plume modeling predicts maximum surface temperatures under zero ambient current conditions. Figure 2 shows the recommended locations for the proposed surface discharge stations (solid green dots). The surface monitoring stations near the Y-discharge will be installed along the centerline of the discharge pipes approximately 75 to 150 ft from the point of discharge (see Insert A, Figure 1). The final location will be determined during station deployment by measuring surface temperatures and placing the station at the location with the maximum observed temperature. For the multiport diffuser, one monitoring station will be located approximately 25-ft north of the centerline of the discharge pipe and about 400-ft offshore from the start of the diffuser. This location corresponds approximately to the point of maximum temperature as predicted by the thermal modeling (see Insert B, Figure 1). The final location will be determined during station deployment by measuring surface temperatures and placing the station at the location with the maximum temperature. The final station locations will be mapped using GPS navigation. Temperature loggers at these three stations will be installed at the surface only.

To define the surface temperature increase of the heated water it is important to note that the heated water rises above the ambient water and the near-surface temperature is the important measurement.

Also, since the heated water moves up and down with tides and wave motion, the plume measurement needs to be relative to a moving surface. Therefore, to ensure that these stations are always measuring the water temperature within 1 to 2 ft of the surface, the thermometers will be mounted to the bottom of the surface buoys.

3.2 18-ft Contour Monitoring Stations The 18-ft contour, as determined from Coast & Geodetic Survey charts, is the demarcation line between the Open Ocean and Coastal Waters as defined in Chapter 62-302.520, FAC. Therefore, three Final Rev. docsscates

September 2011 6 103-87735 Rev. 1 monitoring stations (one north of the Y-discharge pipe, one south of the intake structures, and one between the St. Lucie Plant's discharge pipes) will be established at the 18-ft. contour (solid red dots, Figure 2). The monitoring station at the 18-ft contour midway between the two discharge pipes is designed to cover an onshore current condition. This is also the closest point in coastal waters to the source of heated water. The north and south monitoring stations will be located approximately 0.5 to 1 mile north and south of the discharge structures. These are the two segments of the shoreline where the thermal plume modeling shows the greatest possibility of plume encroachment into coastal waters when the offshore currents are predominately from the north or south. All three of these monitoring stations will have temperature loggers near the surface, at mid-depth, and near the bottom.

3.3 Cooling Water Intake Monitoring Station In order to evaluate the potential re-entrainment of the heated plume, a monitoring station will be deployed near the water entrance to the intake velocity caps (open red circle, Figure 2). For this monitoring station, two temperature loggers will be located at a water depth equal to the intakes and one additional logger will be installed near the surface to determine if heated water passes above the velocity caps, without affecting the temperature of the water entering the plant.

For the intake temperature measurements the elevation above the seafloor is the critical reference as the intake structure is at a fixed elevation. Therefore, the intake thermometers will be mounted at the elevation corresponding to the mid-point of the velocity cap openings. For the surface temperature measurement the thermometers will be mounted to the bottom of the surface buoy.

3.4 Ambient/Background Monitoring Station To meet the requirements of the Administrative Order, it will be necessary to record the temperature of the ambient water (i.e., water unaffected by the heated water discharge). To optimize the collection of ambient/background data, a temperature monitoring station will be established offshore and southeast of the intake structures (open green circle, Figure 2). The Ambient/Background Monitoring station location and instruments (thermometers) array was selected to address the following considerations:

" The monitoring station must be seaward of the most seaward 18-ft depth contour.

" The monitoring station should be near the intake structures.

" The monitoring station should be outside the hydraulic influence of the intake structure.

Based on the quantity of water withdrawn, there should be at least 500 ft between the ambient monitoring station and the nearest intake structure.

• The intake structure is located in 24 ft of water. Therefore, the ambient monitoring station should be located in water at least 30-ft deep, so that the lowest thermometer can be mounted above the anchor structure at a depth about equal to the water depth at the intake (24 ft).

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" To minimize potential influence of the discharge plume and simultaneously minimize the distance from the intake structure, the ambient monitoring station should be located southeast of the intake structure.

• Six thermometers will be installed at the ambient monitoring station at the following depths:

0 2 ft below the surface (surface temperature)

• 7 ft below the surface (top of the intake structures) 9 12 ft below the surface (top of the intake opening)

• 15 ft below the surface (middle of the intake opening)

• 18 ft below the surface (bottom of the intake opening)

• 24 ft below the surface (depth at the intake structures)

With this vertical array of instruments, if the thermal plume reaches the monitoring station, the vertical extent of the plume can be established and the appropriate ambient temperature can be determined.

3.5 Intake and Discharge Canal Monitoring Stations To assist in evaluating the extent of recirculation of heated effluent to the plant intake, an additional temperature monitoring station will be located at the eastern end of the intake canal; near the headwall at the entrance to the intake canal (solid green dot, Figure 2). These thermometers (primary and backup) will be located at mid-depth near the inflow point, where the water is well mixed. The temperature loggers installed at this location will be mounted to a secure fixed structure. The design for the logger mount will be approved by FPL prior to installation.

Temperature data from the existing installed plant temperature instruments at the intake (permit monitoring station INT-1, not shown on Figure 2) and at the point-of-discharge (permit monitoring station EFF-2, yellow dot with red border shown in Figure 2) will also be obtained and used for this analysis.

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September2011 8 103-87735 Rev. 1 4.0 INSTRUMENTATION Real-time monitoring of water temperature data is not required for the HWPOS. Therefore, non-cabled, stand-alone, diver-serviced temperature loggers will be installed. Onset HOBO Pro V2 temperature data loggers will be used. The small size of the HOBO Pro V2 allows for easy installation and servicing in the field. The accuracy, precision, and range of the HOBO Pro V2 temperature data logger provides for excellent data collection for the expected temperatures of the project (see Appendix A - Equipment Specifications). The operational range for these temperature loggers is -4 0 °Celsius (°C) to 700C (-400 F to 1580 F).

The temperature loggers will be factory calibrated and verified before deployment using NIST-traceable standard thermometer at several temperatures in the expected sample measurement range following appropriate FDEP SOPs. A NIST calibration certificate will be provided for each temperature logger.

The following procedure will be used to ensure that all temperature loggers are providing consistent temperature readings over a range of temperatures and to document any small systematic deviations.

Then, corrections can be applied as necessary and appropriate to individual loggers to obtain consistent temperatures. Before the temperature loggers are deployed for the heated water study, all the loggers will be deployed simultaneously and in close proximity to one another for at least 24-hours; first in the discharge canal near the FPL discharge monitoring station and then in the ocean. The discharge canal is well mixed and will act as a warm water temperature bath. The ocean will act as the cool temperature bath. Immediately following deployment in these two locations, the data will be downloaded and the temperature from each thermometer will be compared to the temperature from the discharge monitoring station and to the average of all the temperature loggers.

As shown in the equipment specifications (Appendix A) the temperature loggers that will be used are very stable. The stability rating (drift) is only 0.10C per year. Nevertheless, to ensure that all temperature loggers are providing consistent and accurate readings over the full duration of the study the following verification procedures will be used. Once each year after initial deployment until the monitoring study is complete, and again at the end of the study during demobilization, the instrument temperature readings will be verified. All the instruments will be temporarily removed from their moorings and placed in close proximity to one another at one location in the ocean. A NIST-traceable standard thermometer will be used to determine the ocean temperature at the common location. The instruments and the NIST-traceable thermometer will be deployed at the common location for at least two hours to obtain stable temperature readings. When the verification is complete, the instruments will be reinstalled on the moorings. In addition, a NIST-traceable thermometer will be used to record the ocean temperature at each temperature logger whenever a temperature logger is installed or removed from the mooring for maintenance or data download.

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.September2011 9 Rev. 1 5.0 MONITORING STATION BUOY ARRAY The temperature array consisting of a surface buoy, multiple subsurface buoys, and an anchor will be used for each monitoring station (see Figure 3). This design provides less buoy surface area in the upper water column where most of the hydrodynamic forces induced by currents and wave action exist. The subsurface buoys, which are installed at regular intervals along the mooring cable, will provide the support needed to maintain the temperature loggers at their required depths in the water column and reduce the overall movement of the mooring. The number of subsurface buoys will be determined based on the number of temperature loggers to be installed. A minimum of three subsurface buoys will be used to maintain design requirements. The surface buoy provides easy location, day markings, and a suitable structure for lighting.

The anchor, cable, hardware and buoys used for the monitoring buoy array will be constructed so that the temperature loggers and array components will be able to withstand a reasonable degree of accidental entanglement due to high boat traffic, anchor or fishing line entanglement, divers/swimmers, etc., and intentional vandalism. An assessment of the monitoring station array construction will be made during the first month maintenance/service event and needed modifications will be implemented.

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.September2011 10 Rev. 1 6.0 DATA COLLECTION All data collection efforts for this project will follow FDEP approved quality assurance/quality control (QA/QC) procedures.

Because the HOBO Pro-V2 temperature loggers are small and relatively inexpensive, redundant loggers will be installed along with each primary logger. All temperature loggers will be installed, retrieved, maintained, and serviced using SCUBA divers. The Pro-V2 loggers will be removed from the mooring, and the recorded data will be downloaded to a computer on board the diving support vessel. Once the data download is completed and verified, the loggers will be reinstalled on the mooring.

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September 2011 11 1 7.0 MAINTENANCE AND SERVICING Regular scheduled maintenance/servicing events are critical to keeping the thermal monitoring systems functioning properly and to ensure acceptable data recovery. Initially, monthly maintenance/servicing events will be conducted to ensure instrumentation/data is not being compromised, by accident or vandalism, to the point where the required data can't be retrieved to meet the study objectives. After the first 3 months, it will be determined if more or less frequently scheduled maintenance/servicing events will provide for confident data collection.

During each maintenance/servicing event, all buoy and mooring components will be checked for wear and replaced if necessary. The mooring station location will be verified using GPS navigation equipment, and repositioned if necessary. Additional contingency maintenance/servicing events (including temporary monitoring station removal, if necessary) will be conducted in the event of storms or other identified equipment problems.

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103-87735 September 2011 12 Rev. 1 8.0 CURRENT PROFILING An Acoustic Doppler Current Profiler (ADCP) that can provide current direction and velocity at multiple levels (i.e., multiple depths throughout the water column) will be installed offshore south of the diffuser discharge (solid red rectangles, Figure 2). A second ADCP will be installed at the 18-ft contour between the discharge pipes. The current data will provide an indication of discharge water movements from the near shore location and the offshore location.

A Nortek Z-cell 1 megahertz (MHz) model ADCP will be used for this project (see Appendix A -

Equipment Specifications). The Z-cell 1 MHz was chosen to achieve the best accuracy and resolution for the expected water depth of the study area.

The Nortek Z-cell ADCPs are factory calibrated and, with the exception of the internal compass, do not require field calibration, as long as the transducer heads are not physically deformed. Prior to deployment, a compass calibration will be performed and documented. Also, at the completion of the project, the ADCPs will be sent back to the factory for calibration verification.

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• i~;R 13 1September2011 9.0 OTHER REQUIREMENTS 9.1 Permit Requirements The following permits (to be obtained by contractor) will be required for installation of the temperature monitoring arrays:

" FDEP Environmental Resource Permit with submerged Lands Lease; and

" US Army Corps of Engineers (USACE) Nationwide Permit 5.

9.2 Demobilization After completion of the 24 month Heated Water Plan of Study all monitoring station arrays, canal temperature loggers, and ADCPs, plus any associated support equipment, will be removed from the study area. A diver survey of the offshore area will be conducted to verify nothing has been left on the bottom.

All instruments will be tested and calibrations verified.

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S103-87735 September 2011 14 Rev. 1 10.0 HEATED WATER REPORT After completion of the 24-month field data collection effort for the Heated Water Study, a Heated Water Report will be submitted according to the schedule shown in Section 11. The report will discuss, at a minimum, the purpose and scope of the study, the methodology, data recovery, a descriptive and statistical summary of temperature and ADCP data in graphical or tabular format, and the results and conclusions (including an evaluation of the potential for re-entrainment of the heated plume). The contractor will also provide the data files to FPL in an electronic format.

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Set Septembere 2103-87735 2011 15 Rev. 1 11.0 SCHEDULE The schedule for implementing the HWPOS is shown in Table 1, Projected Implementation Schedule.

The HWPOS schedule is tied to the startup of St. Lucie Unit 2 following completion of the uprate (TO),

which is currently scheduled for 9/30/2012. The installation of the moorings is scheduled to coincide with the outage of one unit to take advantage of the lower discharge flow rate.

GOLDER ASSOCIATES INC.

Gregory M. Powell, PhD, PE Isabel Johnson Senior Consultant and Principal Senior Consultant and Associate GMP/ams FN: G:\Projects\103\103-87\103-87735\FINAL HWPOS\Final Rev 1 docx

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TABLES September 2011 103-87735 - Rev. 1 Table 1- Projected Implementation Schedule Item Elapsed Time or Projected Projected No. Task or Milestone Description Duration Start Completion Remarks (Calendar Days) Date Date HWPOS due to FDEP <180 days from 1 FPL Submits HWPOS to FDEP 1 6/21/2011 6/21/2011 efetv dae o AO <8dsr effective date of A0022T-L 2 Estimated period of FDEP approval 90 6/21/2011 9/19/2011 3* FPL issues Notice to Proceed (Projected for 1 1/31/2012 1/31/2012 Award of Contract) 4* Equipment Procurement and Preparation 147 2/1/2012 6/27/2012 5* Installation of Moorings 94 6/28/2012 9/30/2012 Reduced Flow Conditions 6* Instrument Calibration, Installation and Testing 94 6/28/2012 9/30/2012 Reduced Flow Conditions 7' Commence St. Lucie Second Unit EPU 1 9/30/2012 9/30/2012 To Date Operation HWPOS monitoring must commence 8* Perform Post-EPU Heated Water Field 730 9/30/2012 9/30/2014 < 90 days from start date of 2 nd EPU Studies Unit (To) and continue for > 24 months.

HWPOS monitoring must commence 8A* Perform Post-EPU Heated Water Field 730 12/29/2012 12/29/2014 <_90 days from start date of 2 nd EPU Studies (AO time range alternate) Unit (To) and continue for > 24 months.

9* Maintain HWPOS Equipment 730 9/30/2012 9/30/2014 10* Data Analysis and Evaluation 60 10/1/2012 11/30/2014 Heated Water Report must be 11* Heated Water Report Preparation/Review 119 10/1/2014 1/27/2015 submitted to FDEP < 120 days after III _ I___completion of HWPOS.

12* FPL Submits Heated Water Report to FDEP 1 1/28/2015 1/28/2015

• Dates subject to change due to EPU or operating schedule changes. Dates shown are based upon current Unit 2 start-up date, as provided in the Approved Operating Schedule dated March 11, 2011 Final Table 1.docxO

ýDlder V`-Associates

FIGURES INSET A Y-Nozzle Y-Nozzle Before Uprate Y-Nozzle After Uprate 0 25 50 Feet 1 inch = 50 feet INSET B Multiport Nozzle Multiport Nozle Before Uprate Multiport Nozzle After Uprate 0 6.5 13 Feet 1 inch = 13 feet I I I I I I R-JCT FPL ST. LUCIE NOTE IT.E Thermal plume delineated by the 96 degree F. isotherm. ST. LUCIE NUCLEAR PLANT AND THERMAL DISCHARGE PLUME REFERENCES

1. Thermal Plumes, GolderAssociales nrc.T2009 M I't!L A Go aderr1 .- I I z22I FIGURE oeoog FIGURE I1

LEGEND

-- Discharge Pipes (Approximate)

• Surface Temperature Monitoring Location Surface-Mid Water-Near Bottom Temperature Monitoring Location on the 18-ft Contour Temperature Monitoring Location at 0 Level of Intake Entrance and at Surface Multi-Level Temperature Monitoring o Location - 2', 7', 12', 15', 18', and 24' ADCP (Acoustic Doppler Current Profiler)

Monitoring Location FPL Temperature Monitoring Location Monitoring Locations NOTES Updated Temperature Monitoring Locations as of 4113/2011 REFERENCES

1. Discharge Pipes, DischargeArea, Monitoring Locations, GolderAssociates Inc., 2010.

0 350 700

, I Feet EV. DATE DES REVISIONDESCRIPTION DIS C-I RVW iOJECT FPL ST. LUCIE THERMAL MONITORING TLE HEATED WATER SAMPLING MONITORING LOCATIONS 103-87735 FPROJECTNo FILENo. 103a7735.B.3 SCALE:AS'SHOWN REV, I I Golder jWDESIGN SSSOCiateS GIS CHECK STh NRL IJ 121515,1 1 FIGURE 2

June 2011 103-87735 103-87735 June 2011 m = HOBO Temperature data logger Figure 3.

Temperature Array Consisting of a Surface Buoy, Multiple Subsurface Buoys, and an Anchor G le Source: CSA, 2011; Golder, 2011.

A-ssociates G:\Projects\103\103-87\l03-87735SFINAL HWPOSXFinmlFigures\Fig 3.docx

APPENDIX A EQUIPMENT SPECIFICATIONS

103-87735 September 2011 Rev. 1 APPENDIX A EQUIPMENT SPECIFICATIONS 4/20/2011 Data Sheet for the U22-001 onset HOBO Pro v2 Water Temperature Data Logger - U22-001 Water Temperature (400 ft.)

Measures*

Features:

a Researh-grade nea uremnlt at an ffovdtabl price

" Waterproof to 120 meters (400 feet)

" Data readout in less than 20 seconds va fast Sp(r ote B mterfacpe

Description:

The durable HOBO Water Temp Pro v2 has 12 bit reso utiro anr a precision sensor for +/-0.20C accuracy over a vvoe temperature range.

Des gned vth a durable streaml ned case for extended deployment n fresh or salt i*ater, the Water Temp Pro 2 is equipped lath an Optic USE interface for data offload in the field, even When the data Jogger is i-et Fo accurate ambient air temperature measurement in sunlight a solar radiation shield is required (RS1 Solar Radiation Shield, assem bl requrred, M pre-assembtld Solar Radiation Shield)

Optical Intlirfae. for dritartanoll. - lik-i croon Detailed Speclflcat Ions:

0 Operation tanse : -400 to 70 C (-400 to ISJPF) in air; masimum sustained temperature of 500C (122'F) in nate, 0 0 0 Accuracy: 0.2 C ove 0' to 500C (0.36 F over 32" to 122 F) se, Plot A Resolution: 0.02-C at 25-C (0.04-F at 77l'), see Plot A Response tim e: (90% ) 5 m inutes ir water: 12 m inutes in air m oving 2 m /sec (typical) -- . . . . .. . .

Stability (drift): 0.1 C (0, l8ot) per year Logger Real-time cloci. +/- I minute per month 00 to 501C (320 to I i2F)

Battery: 2/3 AA, 3.6 Volt Lithium, factory-replaceable ONLY Battery life (typical use): 6 years with I minute or greater logging interval Memory (non-vo atile) 64K bytes memory (approx 42,000 12 bit temperat*re measurements)

Weight. 42 g (1.5 oz)

Dimensions: 3.0 cm (1.,19 in.) maximum diameter, 1 14 cm (4.5 i *) en-gth; mounting hole 6.3 mm (0.25 inches) diameter Wetted materials Polypropyiene case, EPDMý, o-rings, stainless stee retain ing ng Buoyancy (fresh water): ÷13 g (0,5 oz,) in fresh mater at 251C (77*F)- .17 g (0 6 oz.) lith optional boot Waterproof; To 120 m (400 ft.)

Shock/drop: 1+5 m (5 ft.) drop at 00C to 70(C (321F to 1500F)

Logging interval: Fixed-rate or multiple logging intervals, v*th up to 8 user-defined logging intervals and durations; logging intervals from 1 second to 18 hours2.083333e-4 days <br />0.005 hours <br />2.97619e-5 weeks <br />6.849e-6 months <br />. Refer to HOBOware soft-lare manual Launch modes, Immediate start and delayed start www.onsetconmp.com/dati-sheet php?... 1/2 g:\projects\103\103-87\103-87735\appendix a.aocx 1320~M4Asociates Golder

ASeptember 103-87735 2011 Rev. 1 4/20/21D1 Data Sheet for the U22-001 Offload modes: Offload while loggingý stop and offload Battery indication: Battery voltage can be viewed in status screen and optionally logged in datafile. Low battery indication in datafile.

NIST certificate Available: for additional charge The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).

tIMPORTANT: The plastic case will become brittle attemperatures lower than -200C, If the logger is deployed in a location where the temperature 5drops below -200C, make sure the logger remains stationary and is not pulled on or struck. Return the logger to above -20 C before handling.

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103-87735 September 2011 Rev. 1 Ascesstitofrequency: Q.4MH 0.1r4H 1.0MHz 2.0MHz DCinput: 9-INDC Maximum profiling range* 0-t0m 30-405m 12-20m 4-1Oin Peuk oumart 3A Call fire: 2-8m 1-4m 0.3-4m 0.1-2m hx average c ons umption 0 2-1 ,60 at 1H:

Seam width: 3.7" 3.0 32.4' 1" Minimum bssnkkv: 1m 0.50m 0.20m 0.*6m Sleep comumptlon: 0.0003 irnW(RS232 0.005 rst (RS4221 Transrnstpower* 0.3-20W, 3 adjustable levels Numberotbeamrn 3 Mfiinmunmo#alc: 128 VelocityPange siOr/s (inquire foreatended range) Acosuny +/- lm*yeatr Accuracy 1% of mesutred valie *O.fon.s kokup inmabsence d power 4 weeks Max. Sampling rate 1Hr Typp*oepa)sl 18 AA At~mine sdslW/h Vetos uncertainty: Consult soltware program

-] The Aquadopp profiler measures the current profile insa user specified number New batteryoltlag e: 13.5VDC of celts from the irnstrument out to a maximuemsrange that depends onthe aooustc Duation(10-.minuteav): 80 days tor2ltH 0.ITs eels scattering oonditinns. The lower range should be expected with cearwaterand 50 days for 1MHz 1.Or cells snmal cals and the higher nrnge wlth large cellsand aocoustlcall turbid water Eract baftery coonsumptios and velocity uncestaintyare ctnpa functrans of the dep*oyment oonfiguratior Plase consul the AqsePro software for more exact Del* ceroaca oustls h'equ soy: 2M1 aredictk*r.

Maximum profiling range: 0.4-0O9m N1umberof bumrr: 3 Slandeud: DOeldand pol.uratheam plasbis with tilanum screws Samplin g: Smeasvelmily Intermediate and deepseater Tiani*r*and Delnn plestics models Resolution: 0.45dB Dynsamli an*.: 0dB Bulthead:(Ipulso: MCBHW-FS Cable PMCIL.8-MP on 0-in psyurdfrne cable Temperature: Thernistcr embedded Range. -4Cto3VC Opeating tempesature: -roto3ro Asoeur*cyesollutl*ws 0.1VIO3, Storage temperature: -20'C to 60,C Tim responsse: 10 mi Shook assdvsbrntioes: lEG72-3--2 Compass: tagnotoneter Depth itng: 300m A0ouracy/resotution: 2r1l 1"fatft<20' Tilt: Uquid Ieel 0.4MHz 0.1MHz 14a H2rMHdz Accuracyi/resolution 0.21111" Welghtinair 3.4 kg 20 kg 22 kg Miodmusimtft: 30" Wl*ghtlin water 0.2 kg 0.4 kg 02 kg Up or down* Autornsabcdetect Length seede*ersiorrldrawings P ressure Pieronreistive Dlemeter seeddlmemiomeldra*wigs Range 0-100mn(stndard)

Acsurracirnsolutlon: O50.M05% o fuelscatle Batteres: Lithium, L-loreohaeble Ektmrealbatteres: Alkaline, tUhum or Ulskixn tr.

Number of channes: 2 Sea battery brachurefor dellas Votage supply: Three options selectable through Transducer had: Right angle head forl or2MHr.

firmsrwacommands: Inquire for specalclcsfigurations eiattery vodtage 500 OmA Deep ater systeme lgukefort3a000m & S801nverslcns

• +.51250 rso

-+12V /100 mA Cornmunisattcen Request special tlrnes* fa RS422 Voltage input 0-5V Resoulirc 18 bitAID s/: RS23Z R5422 Software supports most commercilsly asvilable USB-RS232 converters Commueniatios Baud ate 300-11 M00(baud)

Recorder download baud ratew 80(1200 k.sBaudfor both RS32 andRS422 OMEB, canadd32178.W .tB&4G1 Prdog AiiM Datar oord: 32 bytes + QxNoefls Mode Stopwhen fuN(daault) or wrap mode Software* AquePro Winedowy@P, W*Wdowsel 'IT Operating system Functions Depyqmnent planning, drta retrievL ASCIIconversios online data collection, and graphical disptly NOseMed $AAS Z.LTouton Esl ?tAdtleHWemHihey

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Golder Associates Inc.

6026 NW 1st Place Gainesville, FL 32607 USA Tel: (352) 336-5600 Fax: (352) 336-6603 Golder, Golder Associates and the GA globe design are trademarks of Golder Associates Corporation